Rational amelioration of redox equilibrium by constructing hollow nanotube Co-Mn/TiO2 catalyst to boost simultaneous removal of NO and Hg0

Simultaneous removal of NO and Hg0 in one purification unit is cost-effective, while the conflicting redox environmental requirements remains extremely challenging. Herein, hollow nanotube Co-Mn/TiO2 was elaborately fabricated by reconstructing nanoparticles to ameliorate the redox equilibrium, allowing the catalysts to sustain the excellent synergistic catalytic performance, which delivered more than 98% NOx conversion with above 95% N2 selectivity and nearly 100% Hg0 removal efficiency within 150-240 ˚C. Abundant oxygen vacancies and strong surface acidity were synchronously generated after the formation of unique hollow nanotube, improving the mobility of oxygen species and facilitating the adsorption and activation of reactants, and the cooperation of oxygen vacancy and surface acidity resulted in superior simultaneous removal activity. Strikingly, in situ DRIFTS and kinetic results revealed that the reaction rate was obviously accelerated on hollow nanotube Co-Mn/TiO2. This study provided new insights toward engineering efficient catalysts for simultaneous removal of NO and Hg0.